I'm developing iOS framework with Objective C. I create a dispatch_queue_t by using dispatch_queue_create. And call CFRunLoopRun() for run the Runloop in the queue. But, It looks like the dispatch_queue_t has share the RunLoop. Some classes has add an invalid timer, and when I call the CFRunLoopRun(), It crashed on my side. Sample code: - (void)viewDidLoad { [super viewDidLoad]; self.queue1 = dispatch_queue_create("com.queue1", DISPATCH_QUEUE_CONCURRENT); self.queue2 = dispatch_queue_create("org.queue2", DISPATCH_QUEUE_CONCURRENT); } - (IBAction)btnButtonAction:(id)sender { dispatch_async(self.queue1, ^{ NSString *runloop = [NSString stringWithFormat:@"%@", CFRunLoopGetCurrent()]; runloop = [runloop substringWithRange:NSMakeRange(0, 22)]; NSLog(@"Queue1 %p run: %@", self.queue1, runloop); //NSTimer *timer = [[NSTimer alloc] initWithFireDate:[NSDate date] interval:1 target:self selector:@selector(wrongSeletor:) userInfo:nil repeats:NO]; //[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes]; }); dispatch_async(self.queue2, ^{ NSString *runloop = [NSString stringWithFormat:@"%@", CFRunLoopGetCurrent()]; runloop = [runloop substringWithRange:NSMakeRange(0, 22)]; NSLog(@"Queue2 %p run: %@", self.queue2, runloop); CFRunLoopRun(); }); } Some time they take same RunLoop: https://i.stack.imgur.com/wGcv3.png ===== You can see the crash by uncomment the code of NSTimer. The NSTimer has been added in queue1, but it still running when call CFRunLoopRun() in queue2. I have read some description like: https://stackoverflow.com/questions/38000727/need-some-clarifications-about-dispatch-queue-thread-and-nsrunloop They told that: "system creates a run loop for the thread". But, in my check, they are sharing the RunLoop. This is sad for me, because I facing that crashes happen when calling CFRunLoopRun() on production. Can someone take a look at this.

I'm facing an issue about Push Notification with Notification Service Extension (NSE). Steps: Allow Push Permissions and a valid device_token has been returned. The Push Notification come successfully and has handled by NSE. The NSE take some seconds for complete. When a Push is coming and the NSE is processing (not call contentHandler yet). Quickly delete the app. Then, we reinstall the app. Now, we can see: A content of push was called to didReceiveRemoteNotification of AppDelegate of main app (Not NSE). A valid device token has been returned to didRegisterForRemoteNotificationsWithDeviceToken without calling registerForRemoteNotifications and any Permissions. We can use this device_token to push. I can see it on: iOS 16.3 (Beta), iOS 16.1.1 (Final)... I can check the Permissions of the Push Notification before use the device_token. But It doesn't make sense. Do we have some best solutions for this? Thanks.